Enhancement of thermal donor formation in germanium by preliminary irradiation: infrared absorption measurements
| Autor: | L.I. Murin, J. L. Lindström, Vladimir P. Markevich, A. A. Klechko, V. V. Litvinov |
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| Rok vydání: | 2001 |
| Předmět: |
Materials science
Absorption spectroscopy Dimer Analytical chemistry chemistry.chemical_element Infrared spectroscopy Germanium Condensed Matter Physics Oxygen Electronic Optical and Magnetic Materials chemistry.chemical_compound Nuclear magnetic resonance chemistry Molecular vibration Electron beam processing Irradiation Electrical and Electronic Engineering |
| Zdroj: | Physica B: Condensed Matter. :201-205 |
| ISSN: | 0921-4526 |
| Popis: | Infrared absorption at 10 K of oxygen-rich Ge crystals after irradiation with fast electrons ( E =4 MeV, T ≈100°C) and subsequent annealing at 220–420°C has been studied. It is found that upon heat-treatments of the irradiated samples at 220–280°C the simultaneous formation of four bistable thermal donors (TD1–TD4) occurs. This process is not accompanied by detectable changes in intensities of absorption bands at 780.4 and 818.0 cm −1 , which are related to the oxygen dimer. Upon following anneals of the samples at 300–420°C, the strongly enhanced generation of the higher order TDs is observed with a simultaneous decrease in intensities of the bands originated from the oxygen dimer, TD1 and TD2. It is inferred that direct transformations of some radiation-induced defects into the first TD species occur in the irradiated samples. Radiation-induced complexes giving rise to local vibrational modes in the region 570–577 cm −1 and/or at 729, 733.5 and 745 cm −1 are suggested as possible precursors to the bistable TDs in Ge. |
| Databáze: | OpenAIRE |
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